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04 4.0 engine knock/rattle as RMP drops!


Cheaplabor

Well-Known Member
Joined
Dec 12, 2008
Messages
111
City
MT
Vehicle Year
04
Transmission
Automatic
My O4 Ranger has been having a knock/rattle sound comming from the 4.0 engine and cant figure it out. I have searched and found that they get the timing chain rattle at 2000-3000 RMP but this happens light at idle and 3-4 loud as i come to a stop and the RPMs drop between 1500 and idle. It sounded like belt tentioner was rattling but replace it and idler and no change. I removed the belt and started and can still hear light rattle. Any ideas would help.
 
Does it make a rattling noise when the A/C is on? Your issue sounds more like a balance shaft going bad.
 
Yep ac on or off. It has a low rattle at idle(just noticeable) and when you slow to a stop and the RPMs drop it makes a louder rattle(3-4) as it drops around 1500 back to idle.
 

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